UA 5210 then AA 4330 at O'Hare
Saginaw → Chicago → Springfield (SPI)
Timetable, Chicago time
14:15UA 5210 from Saginaw at the gate
13:28AA 4330 to Springfield (SPI) leaves the gate
23 h 13 apart on the timetable, overnight
AA 4330 leaves 23 h 13 after UA 5210 arrives on the timetable: more than half a day, so not a connection we count.